CN104080576B

CN104080576B - Cooling agent feedway and supply method

Info

Publication number: CN104080576B
Application number: CN201180074594.5A
Authority: CN
Inventors: 川野裕司
Original assignee: Nippon Oil Pump Co Ltd
Current assignee: Nippon Oil Pump Co Ltd
Priority date: 2011-10-31
Filing date: 2011-10-31
Publication date: 2016-05-25
Anticipated expiration: 2031-10-31
Also published as: EP2774719A4; KR101808580B1; WO2013065097A1; EP2774719A1; DK2774719T3; KR20140096264A; CN104080576A; IN2014CN03970A; US9566681B2; US20140284041A1; JPWO2013065097A1; EP2774719B1; JP5813129B2

Abstract

The object of this invention is to provide a kind of cooling agent feedway and the supply method that can only suitably control the injection of cooling agent by single parameter. Therefore, in the present invention, possess measuring device (22) from the pressure that spues of pump (101), the instrumentation pump (101) of cooling agent to instrument (D) and the control device (50) of supplying with; Control device (50) has following function: according to the rotating speed of pump (101), and the spue desired value (goal pressure) of pressure of the pump when cooling agent of decision instrument (D) is bored a hole with stream diameter with instrument (D).

Description

Cooling agent feedway and supply method

Technical field

The present invention relates to lathe, particularly center cutting element that drill bit by (axle is passed through) cooling formulation etc. has oilhole and supply with the technology of cooling agent.

Background technology

In machining center at the center shown in Fig. 9 by (axle is passed through) cooling formulation, machining center 200 possesses processing workbench 205, main shaft 210, instrument 220, coolant jet 240. With on workbench 205, be fixed wtih the workpiece 400 as machined object in processing. Cooling medium pump 100 shown in Fig. 9 is pumps of the type that the cooling agent of the cooling agent of low pressure and high pressure spued from a pump.

The high-tension line Lh of cooling medium pump 100 is communicated with instrument 220, and the low-voltage circuit Ll of cooling medium pump 100 is communicated with coolant jet 240.

Cooling medium pump 100 is arranged on the storage bin 300 of cooling agent.

In the machining center 200 of Fig. 9, the cooling agent of the low pressure spuing from cooling medium pump 100 is supplied with to nozzle 240, is sprayed towards workpiece 400 entirety from nozzle 240. Cutting powder processing is removed to the cooling agent of workpiece 400 entirety ejections from nozzle 240.

On the other hand, the high pressure being spued from cooling medium pump 100 and clean cooling agent spray from the front end of instrument 220. By cooling agent being sprayed with high pressure from instrument 220 front ends, prevent that cutting blade from nipping etc. to workpiece 400, improve machining accuracy.

The instrument 220 that the pressure coolant of Fig. 9 is used, pressure coolant flows through the coolant flow path that instrument central portion is connected, and the workpiece ejected coolant of corresponding processing, is that so-called center is by the lathe of cooling formulation.

Pass through in the lathe of cooling agent at center as shown in Figure 9, in order correctly to carry out machining, the injection of suitably controlling cooling agent is important.

As other conventional art, following technology is also proposed: carry out and carry out so-called fixed horsepower running so that the pressure versus flow of cooling agent long-pending is roughly certain control (for example,, with reference to patent documentation 1).

But, make control that pressure versus flow long-pending of cooling agent be roughly the fixed horsepower running of certain what is called also because the parameter that should control exists two kinds of pressure and flow, so have, control itself is complicated, the complicated problem of control system thereupon.

Patent documentation 1: specially permit No. 4250999 communique.

Summary of the invention

The present invention proposes in view of the problem of above-mentioned conventional art, and object is to provide a kind of cooling agent feedway and the supply method that can only suitably control the injection of cooling agent by single parameter.

Cooling agent feedway of the present invention (500) is characterized in that, possesses measuring device (pump spue pressure measuring device 22) from the pressure that spues of pump (for example gear pump 101), the instrumentation pump (101) of cooling agent to instrument (D: center is by the drill bit of cooling agent) and the control device (control module 50) of for example, supplying with; Control device (50) has: according to the rotating speed of pump (101) (the interim rotating speed of step S5), determine the spue function of desired value (goal pressure) of pressure of pump when the cooling agent of instrument is bored a hole with stream diameter with instrument (D); This desired value (goal pressure) and the pump measuring are spued to pressure ratio, the function that makes the rotating speed (or rotating speed of electro-motor 1) of pump (101) increase or reduce; With the pressure that spues according to the pump measuring, the function whether perforation that judgement is undertaken by instrument (D) has finished.

In cooling agent feedway of the present invention (500), preferably, above-mentioned control device (50) possesses following function: after the no-load running of end instrument (D) (unloading running), in stage of with instrument (D), workpiece bore a hole before processing, and the spue desired value (goal pressure) of pressure of the pump when cooling agent of decision instrument is bored a hole with stream diameter with instrument (D).

Cooling agent supply method of the present invention, it is method from cooling agent feedway (500) to instrument (D: center is by the drill bit of cooling agent) that for example, supplied with cooling agent by, described cooling agent feedway (500) possesses pump (for example gear pump 101), the measuring device of the pressure that spues of instrumentation pump (101) (pump spue pressure measuring device 22) and control device (control module 50), described cooling agent supply method is characterised in that, according to the rotating speed of pump (101) (the interim rotating speed of step S5), the spue desired value (goal pressure) of pressure of pump when the cooling agent of decision instrument is bored a hole with stream diameter with instrument (D), the instrumentation pump pressure that spues, spues pressure ratio by above-mentioned desired value (goal pressure) and the pump measuring, and makes the rotating speed (or rotating speed of electro-motor 1) of pump (101) increase or reduce, according to the pump the measuring pressure that spues, judge whether the perforation of being undertaken by instrument (D) finishes.

In cooling agent supply method of the present invention, preferably, after the no-load running of end instrument (D) (unloading running), in stage of with instrument (D), workpiece being bored a hole before processing, the spue desired value (goal pressure) of pressure of the pump when cooling agent of decision instrument (D) is bored a hole with stream diameter with instrument (D).

According to the present invention who possesses said structure, for example, because pressure ratio that desired value (goal pressure) and the pump that measures are spued is carried out control pump and (is spued pressure, make the rotating speed of pump 101 or the rotating speed of electro-motor 1 increase, reduce), so only the pressure that spues of pump (101), for controlling parameter, does not need the FEEDBACK CONTROL of the rotating speed that carries out pump (101) (or electro-motor 1).

That is, according to the present invention, do not need to carry out the speed feedback control of complicated pump (101) (or electro-motor 1), by the pressure that spues of control pump (101) only, just can suitably supply with cooling agent to instrument (D).

In addition, according to the present invention, can be not by the information of the instrument (D) such as the drill bit by cooling agent from center, for example about the cooling agent of the instrument (D) arranging by the information of stream diameter to the input of pump (101) side, and the pump that determines alone the cooling agent stream diameter of instrument (D) and be best suited for this cooling agent stream diameter in pump (101) the side pressure (goal pressure) that spues.

As it will be apparent to those skilled in that, the cooling agent of the instruments (D) such as the drill bit at decision center by cooling agent during with stream diameter, determines that in pump (101) side goal pressure is very difficult corresponding to this automatically. This be because, the combination of instrument (D) and pump (101) has countless, the cooling agent of this instrument (D) also spreads all over sizes with stream diameter in addition.

With respect to this, according to the present invention, can be not by the cooling agent of the instrument (D) such as the drill bit by cooling agent about center by the information of stream diameter to the input of pump (101) side, and determine alone cooling agent stream diameter and the goal pressure of this instrument (D) in pump (101) side.

Therefore, countless even if the combination of instrument (D) and pump (101) has, even if the cooling agent of this instrument (D) exists multiplely with bore dia in addition, also can determine the pressure that spues of optimum cooling agent suitably to carry out the perforation processing by instrument (D).

Brief description of the drawings

Fig. 1 is the block diagram that represents embodiments of the present invention.

Fig. 2 is the functional block diagram of the control module of embodiment.

Fig. 3 is the flow chart that represents the refrigerant injection control of embodiment.

Fig. 4 is the flow chart that represents the refrigerant injection control of embodiment.

Fig. 5 is the performance plot that represents an example of the rotation amount of pump and the characteristic of coolant flow.

Fig. 6 is the performance plot that represents an example of the characteristic of the internal diameter of the cooling agent stream of coolant flow and drill bit.

Fig. 7 is the performance plot that represents the cooling agent internal diameter of stream of drill bit and an example of the characteristic of goal pressure.

Fig. 8 is the performance plot that represents an example of the characteristic of goal pressure and idling speed.

Fig. 9 represents that center is by the block diagram of an example of the machining center of cooling formulation.

Detailed description of the invention

Below, with reference to accompanying drawing, embodiments of the present invention are described.

In Fig. 1, about the cooling agent feedway entirety by reference numeral 500 of embodiments of the present invention represents.

For example, and cooling agent feedway 500 for example possesses pump for cooling agent (gear pump) 101, transfer valve V2(, 3 mouthful of 2 bit-type), coolant reservoir 301 and control device 50.

Cooling agent possesses electro-motor (for example brushless motor) 1, high pressure generating unit (high-pressure pump) 2 and safety valve V1 with pump 101.

At the cooling agent shown in Fig. 1, with in pump 101, high pressure generating unit 2 is rotarilyd actuate by pump driving shaft 5. Pump driving shaft 5 is connected with the rotating shaft 1s of electro-motor 1 by coupling 1C.

Although diagram is omitted, also pump driving shaft 5 and coupling 1C can be omitted, by the rotating shaft 1s of electro-motor 1, high pressure generating unit 2 is directly rotarilyd actuate.

In the illustrated embodiment, in order to make the pressure oscillation that spues of pump 101, make the rotating speed (rotating speed of high-pressure pump 2) of pump 101 or electro-motor 1 increase or reduce.

But, in the illustrated embodiment, do not carry out speed feedback control, the speed feedback control of high-pressure pump 2 or the speed feedback control of electro-motor 1 of pump 101.

On the suction inlet 2i of high pressure generating unit 2, connecting circuit L1. Circuit L1 is in the interior opening of coolant reservoir 301, as the suction circuit performance function of cooling agent.

Be communicated with the 2nd connector C2 via circuit L5 from the spue discharge opening 2o of cooling agent of high pressure generating unit 2.

In circuit L5, in the region of high pressure generating unit 2 sides, be provided with the 1st branch point B1, in the region of the 2nd connector C2 side, be provided with the 2nd branch point B2. Branch out guide's circuit Lp from the 1st branch point B1, cooling agent is pressed to safety valve V1 by the line pressure in pump 101 as guide and supply with.

Branch out the circuit L6 that clamps safety valve V1 from the 2nd branch point B2, circuit L6 is in the interior opening of coolant reservoir 301. In the case of more than the pressure (pressure that spues of high pressure generating unit 2) of circuit L5 rises to regulation, safety valve V1 is open, and the pressure of circuit L5 is loose to the interior row of coolant reservoir 301, guarantees the safety of cooling agent pump 101.

Circuit L5 is communicated with circuit L21 at the 2nd connector C2 place. In circuit L21, for visuognosis flow through circuit L5 cooling agent pressure and clamped pressure gauge 7 for visuognosis. Here, visuognosis is not included in cooling agent with in pump 101 with pressure gauge 7.

Circuit L21 is communicated with flow channel switching valve V2.

In circuit L21, with in the region between pressure gauge 7 and flow channel switching valve V2, clamping instrumentation cooling agent pump 101(high-pressure pump 2 in visuognosis) the pump of the pressure that the spues pressure measuring device (below, being called " pressure gauge spues ") 22 that spues. The instrumentation result of pressure gauge 22 of spuing is sent to control device 50 via input signal circuit Si2.

Discharge side (being left in Fig. 1) and the drill bit D(instrument of flow channel switching valve V2) be connected by circuit L22. In circuit L22, clamping line filter 20 and check-valves V3.

Check-valves V3 allows that cooling agent is from flow channel switching valve V2 to drill bit D side flow. But, do not allow that cooling agent flows to its rightabout (direction from drill bit D side towards flow channel switching valve V2).

Flow channel switching valve V2 receives the control signal of self-control device 50 via control signal circuit So2.

On flow channel switching valve V2, connecting cooling agent return line L23, the other end of cooling agent return line L23 is open near the bottom of coolant reservoir 301.

At drill bit D(instrument) on connecting one end of cooling agent recovery train L30, by cooling agent recovery train L30, the cooling agent after cutting is reclaimed. The other end of cooling agent recovery train L30 is open near the bottom of coolant reservoir 301.

In the time of the cooling agent stream diameter of setting in drill bit D, automatically determine that in pump 101 sides goal pressure is very difficult.

This be because, the combination of drill bit D and pump 101 has countless, the diameter that is formed on the cooling agent stream in this drill bit D also spreads all over sizes. In addition be because the characteristic of the characteristic of drill bit D and pump 101 can be based on service condition, condition is set, other various parameters change according to case.

With respect to this, about the cooling agent feedway 500 of illustrated embodiment has following function: in pump 101 sides, based on the parameter of pump 101 sides, determine to be formed on cooling agent stream diameter in drill bit D and the pump that is best suited for this stream diameter pressure (goal pressure) that spues.

According to the cooling agent feedway 500 about illustrated embodiment, if setting drill bit D and pump 101 and obtaining at first of combination illustrates such various characteristics in Fig. 5～Fig. 8, by the such form of the following stated, the cooling agent of the drill bit D about arranging is not inputted to pump 101 sides by the information of stream diameter, determined alone cooling agent stream diameter and the goal pressure of drill bit D in pump 101 sides.

For control device 50, with reference to describing as Fig. 2 of functional block diagram, described control device 50 has the function that determines the cooling agent stream diameter of drill bit D and the control of goal pressure.

In Fig. 2, control device 50 possesses storage device 50m, goal pressure and determines that spue pressure signal interface 50d, drilling processing signal interface 50e, unloading running controll block 50f, unloading running control signal interface 50g, timer 50t, rotating speed of piece 50b, comparison block 50c, pump determines that piece 50h, speed controling signal produce piece 50j and speed controling signal interface 50k.

Storage device 50m stores interim rotating speed, rotating speed-discharge characteristic, flow-drill bit stream diameter characteristic (flow-coolant flow path diameter characteristic), drill bit stream diameter-goal pressure characteristic (coolant flow path diameter-goal pressure characteristic), goal pressure-idling revolving property. The information being stored in storage device 50m is absolutely necessary in the time that illustrated embodiment is carried out control.

" the interim rotating speed " stored by storage device 50m, it is the rotating speed (rotating speed of cooling agent pump 101 or high pressure generating unit 2) of motor 1, being should stabilize to certain rotating speed (for example 1000rpm) when cooling agent pump 101 is started before the processing of workpiece, is the rotating speed of setting.

Rotating speed-discharge characteristic is the relation of the discharge flow of the rotating speed (the interim rotating speed of the step S5 of the rotating speed of setting: Fig. 3) of cooling medium pump 101 and the pump of each pressure, for example, be characteristic as shown in Figure 5. In Fig. 5, be rotating speed-discharge characteristic of 0Mp～4Mp exemplified with the pressure P c that spues of cooling medium pump 101. In addition, in Fig. 5, the longitudinal axis represents flow, and transverse axis is rotating speed (the interim rotating speed of the step S5 of the rotating speed of setting: Fig. 3).

The stream diameter characteristic of flow-drill bit is the relation that is supplied to the flow in drill bit and is formed on the internal diameter size (cooling agent stream diameter) of the cooling agent stream in drill bit, in the performance plot of Fig. 6, illustrates. In the stream diameter characteristic of the illustrated flow-drill bit of Fig. 6, also using the pressure that spues of cooling medium pump 101 as parameter (Pc is 0Mp, 1Mp～4Mp). In addition, in Fig. 6, the longitudinal axis is flow, and transverse axis is the stream diameter (being shown as " drill bit aperture " in Fig. 6) of drill bit.

Stream diameter-goal pressure characteristic of drill bit is formed in the relation of the goal pressure (target of pump 101 spue pressure) of the cooling agent of cooling agent stream diameter in drill bit and supply, in Fig. 7, illustrates. In addition, in Fig. 7, the longitudinal axis is goal pressure (being shown as " required pressure " in Fig. 7), and transverse axis is the stream diameter (being shown as " drill bit aperture " in Fig. 7) of drill bit.

If the stream of drill bit diameter-goal pressure characteristic is established drill bit (in cooling agent), stream diameter is φ, to establish goal pressure be Pca, for example can show with following formula.

Pca=k?1/φ^ε(k, ε are constants).

Fig. 8 is the performance plot that illustrates goal pressure (target of pump 101 spue pressure) with the relation of the idling speed of cooling medium pump 101 of the cooling agent of supplying with. Here, " idling speed " refers to the rotating speed of the cooling medium pump 101 of (when processing standby) when workpiece cutting.

In addition, although do not illustrate, between motor 1 and high pressure generating unit 2, clamp speed changer etc., also having the rotating speed situation not identical with the rotating speed of high pressure generating unit 2 of motor 1.

Goal pressure determines that piece 50b is connected with storage device 50m by signal line Sc2. Rotating speed-discharge characteristic, flow-drill bit stream diameter characteristic and drill bit stream diameter-goal pressure characteristic of being stored by storage device 50m determined that to goal pressure piece 50b transmits.

Goal pressure determines that piece 50b has following function: pump (or electro-motor) rotating speed (the step S5 of Fig. 3 " interim rotating speed ") and above-mentioned various characteristics based on suitable setting, determine the goal pressure desired value of pressure (pump spue) of pump.

Determine connecting signal line Sc4 on piece 50b in goal pressure. And signal line Sc4, in branch point Bc2 branch, is connected to comparison block 50c and rotating speed and determines on piece 50h.

The information that is determined the pump goal pressure of piece 50b decision by goal pressure is determined that to comparison block 50c and rotating speed piece 50h is transmitted via signal line Sc4.

Comparison block 50c is connected by signal line Sc5 and the pump pressure signal interface 50d that spues, and this pump pressure signal interface 50d that spues is connected by signal line Si2 and the pump pressure measuring device 22 that spues. In addition, comparison block 50c determines that with rotating speed piece 50h is connected by signal line circuit Sc6.

Comparison block 50c is spued pressure measuring device 22 via the spue instrumentation result of the pressure that spues of pressure signal interface 50d input cooling medium pump 101 of pump from pump. And, there is following function: by the desired value comparison of the pressure that spues of the instrumentation result of the pressure that spues of cooling medium pump 101 and cooling medium pump 101, judge the increase and decrease of the rotating speed of pump 101 or motor 1, the control signal (rotating speed increase and decrease signal) of the rotating speed of increase and decrease pump 101 or motor 1 is determined to piece 50h sends via signal line Sc6 to rotating speed.

Drilling processing signal is used interface 50e via signal line Ss and drill bit D(lathe) be connected, there is following function: the signal (drilling processing commencing signal) that will send from drill bit D be inputted to control device 50 in the time that processing starts. In addition, signal line Ss has omitted diagram in Fig. 1.

In Fig. 2, at drilling processing signal with connecting signal line Sc7 on interface 50e. Signal line Sc7, in branch point Bc3 branch, determines that with rotating speed piece 50h and unloading running controll block 50f are connected.

Thus, the drilling processing commencing signal sending from drill bit D in the time that processing starts is determined to rotating speed that via interface 50e, signal line Sc7 for drilling processing signal piece 50h, unloading running controll block 50f transmit.

Rotating speed determines that piece 50h is connected to speed controling signal via signal line Sc8 and produces piece 50j above, is connected with timer 50t via circuit Sc12.

Rotating speed determines that piece 50h has following function: drilling processing commencing signal based on from drilling processing signal interface 50e, be stored in the information about interim rotating speed in storage device 50m and goal pressure-idling speed characteristic, by goal pressure determine pump 101 that piece 50b determines spue the desired value of pressure, from the rotating speed increase and decrease signal of comparison block 50c, carry out the clocking information of self-timer 50t, in each stage of control, determine pump 101(or motor 1) rotating speed.

Determine that about rotating speed piece 50h determines pump 101(or motor 1 in each stage of controlling) the details of form of rotating speed, narrate in the back with reference to Fig. 3, Fig. 4.

Unloading running controll block 50f is connected with interface 50g with unloading running control signal via signal line Sc10. Unloading running control signal is connected with flow channel switching valve V2 via control signal circuit So2 with interface 50g.

Unloading running controll block 50f is passed the drilling processing commencing signal from drill bit D via interface 50e, signal line Sc7 for drilling processing signal. And, there is following function: according to having or not of drilling processing commencing signal, in the situation that cooling medium pump 101 should unload running (before the transmission of drilling processing commencing signal), via unloading running control signal interface 50g, send the control signal of the content that flow channel switching valve V2 is switched to unload side (Fig. 1 " B position ") to flow channel switching valve V2.

Unloading running controll block 50f is connected with timer 50t by signal line Sc11.

Here, send unloading OFF signal, transfer valve V2 be switched to process side (side that cooling agent is carried to drill bit D) (Fig. 1 " A position ") at unloading running controll block 50f, suppose pump 101(or motor 1) stabilization of speed for example, be approximately 1 second (with reference to the step S6 of Fig. 3) to the required time of interim rotating speed (1000rpm: with reference to the step S5 of Fig. 3). Also use timer 50t instrumentation about this required time.

In Fig. 2, speed controling signal produces piece 50j and has following function: produce the pump 101(or the motor 1 that are used for making cooling agent feedway 500) rotating speed become the speed controling signal that is determined the rotating speed that piece 50h determines by rotating speed.

Speed controling signal produces piece 50j and is connected with interface 50k with speed controling signal via signal line Sc9, and this speed controling signal is connected with the motor 1 of cooling agent feedway 500 via control signal circuit So1 with interface 50k. Thus, transmitted to motor 1 from the above-mentioned speed controling signal of speed controling signal generation piece 50j.

Then,, in reference to Fig. 1, Fig. 2, Fig. 5～Fig. 8, based on Fig. 3, Fig. 4, the control in the situation of the drill bit D supply cooling agent of subtend lathe describes.

In the time controlling beginning, in step S1, the S2 of Fig. 3, flow channel switching valve V2 is switched to (unloading ON) to unloading running (no-load running: be " B position " in Fig. 1) side, make the 500 execution unloading runnings of cooling agent feedway.

In the time of unloading running, in flow channel switching valve V2, circuit L21 is communicated with (Fig. 1 " B position ") with circuit L23, and the cooling agent spuing from pump 101 is sent back to coolant reservoir 301.

In step S3, judged whether cooling agent to supply with (drill bit cooling agent ON to drill bit by control device 50?). Control device 50, according to whether having been inputted processing commencing signal from drill bit D side, judges whether cooling agent to supply with to drill bit D.

If do not processed commencing signal from the input of drill bit D side, cooling agent is not supplied with to (step S3 is no) to drill bit, transfer valve V2 is made as to " the B position " in Fig. 1, make cooling agent feedway 500 continue unloading running (step S3 is no circulation).

On the other hand, by from drill bit D side input processing commencing signal, cooling agent is supplied with to drill bit D in the situation that (step S3 is yes), to step, S4 advances, " A position " (state that circuit L21 is communicated with the circuit L22) switching by transfer valve V2 to Fig. 1. Then, advance to step S5.

In step S5, transmit control signal to pump 101 or motor 1, the rotating speed of pump 101 (or rotating speed of motor 1) is set as to interim rotating speed (for example 1000rpm). Here revolution speed (or motor rotary speed) being set as to interim rotating speed (for example 1000rpm), is undertaken by determining frequency. In addition, for example, when revolution speed (or motor rotary speed) is set as to interim rotating speed (1000rpm), start by the timing of timer 50t.

In the step S6 following, control device 50 judges revolution speed to be set as to for example, after interim rotating speed (1000rpm), whether passed through the stipulated time (for example 1 second).

For example, for example, if revolution speed is being set as to do not pass through the stipulated time (1 second) (step S6 is no) after interim rotating speed (1000rpm), standby is until for example, through stipulated time (1 second) (step S6 is no circulation).

If for example, for example,, through stipulated time (1 second) (step S6 is yes), advanced to step S7 revolution speed being set as after interim rotating speed (1000rpm).

In the stage of the step S7 of Fig. 3, for example, after the rotating speed of pump 101 (or rotating speed of motor 1) is set as to interim rotating speed (1000rpm) for example, through stipulated time (1 second) (step S6 is yes), pump 101(or motor 1) rotation become stable state.

In step S7, under the state of the spin stabilization of pump 101, rotating speed (the interim rotating speed in step S5: for example 1000rpm) based on setting and the pressure that spues of the pump 101 of this time point (spue pressure P c) by the spue pump of pressure measuring device 22 instrumentations of pump, use and in Fig. 5, illustrate such rotating speed-pump discharge flow characteristic, determine that by goal pressure piece 50b(is with reference to Fig. 2) determine the discharge flow of the pump 101 of this time point.

Here, not as 1MPa or 2MPa, " rounding off property good (round) " numerical value, pro rate is carried out in the region between (different according to pressure) characteristic of Fig. 5 at pressure, determine rotating speed-pump discharge flow characteristic. ; if pressure is for example 1.3MPa; obtain the region between the characteristic of the pressure 1MPa in Fig. 5 and the characteristic of pressure 2MPa is divided into the such characteristic curve of 3:7; using this characteristic curve as " rotating speed-pump discharge flow characteristic under pressure 1.3MPa ", determine (computing) pump discharge flow according to the revolution speed of this time point.

In step S7, determining after pump discharge flow, determine piece 50b by goal pressure, use the pump discharge flow that determines with Fig. 5 and illustrative flow-drill bit stream diameter characteristic (relation of cooling agent in pump discharge flow and drill bit D use stream internal diameter) in Fig. 6, for example the pump discharge flow determining with Fig. 5 is applied in the longitudinal axis of Fig. 6, thereby determines the drill bit stream diameter (being formed on the internal diameter of the cooling agent stream in drill bit D) as the numerical value in the characteristic of Fig. 6.

In Fig. 6, illustrative flow-drill bit stream diameter characteristic is determined that from storage device 50m to goal pressure piece 50b transmits. Here, in illustrative flow-drill bit stream diameter characteristic by Fig. 6, also not " rounding off property is good " numerical value at pressure, by Fig. 6 (according to pump spue pressure and different) region between characteristic carries out pro rate, determine to spue pressure (by pump pump that pressure measuring device 22 the measures c) corresponding flow-drill bit stream diameter characteristic of pressure P that spues that spues with the pump 101 of this time point. And, use the flow-drill bit stream diameter characteristic determining and the pump discharge flow determining with Fig. 5, determine (computing) drill bit stream diameter (being formed on the internal diameter of the cooling agent stream in drill bit D).

In step S7, if determined drill bit stream diameter, determine piece 50b by goal pressure, use and in Fig. 7, illustrate such drill bit stream diameter-goal pressure characteristic, determine the spue desired value (goal pressure) of pressure of pump.

In Fig. 7, illustrate such drill bit stream diameter-goal pressure characteristic and also determined that from storage device 50m to goal pressure piece 50b transmits.

Determine in piece 50b in goal pressure, illustrate in such drill bit stream diameter-goal pressure characteristic and (the drill bit stream diameter determining with Fig. 6 is applied in the transverse axis of Fig. 7) by the drill bit stream diameter determining with Fig. 6 being applied to by Fig. 7, determine as the spue desired value (goal pressure) of pressure of the pump that illustrates the numerical value on such characteristic line by Fig. 7.

Thus, in the step S7 of Fig. 3, determine the spue desired value (goal pressure) of pressure of pump. Then, advance to step S8.

In the step S8 of Fig. 3, according to the goal pressure determining in step S7, use by Fig. 8 and illustrate such characteristic (goal pressure-idling speed characteristic) decision idling speed.

Idling speed determines piece 50h(Fig. 2 by rotating speed) determine.

Determine piece 50h for rotating speed, transmit by goal pressure and determine the goal pressure that piece 50b the determines desired value of pressure (pump determining spue) in step S7, transmit goal pressure-idling speed characteristic from storage device 50m. Determine in piece 50h at rotating speed, (be for example applied in the goal pressure that determines in step S7 for goal pressure-idling speed characteristic, the goal pressure determining in step S7 is applied in the transverse axis of Fig. 8), determine as the idling speed that is illustrated the numerical value on such characteristic line by Fig. 8.

In step S8, the idling speed that is determined the pump (or motor) that piece 50h determines by rotating speed is produced to piece 50j to speed controling signal and transmit, for pressure P c that pump is spued boosts or step-down, transmit speed controling signal to motor 1. Then, advance to step S9.

In step S9, the answer signal of the content being ready to complete that cooling agent in cooling agent feedway 500 is supplied with sends for example 0.5 second to drill bit D side. In this stage, send processing commencing signal (step S3 be yes) from drill bit D side, until drill bit D touches workpiece 400(with reference to Fig. 9: diagram not in Fig. 1, Fig. 2) above, cooling agent need to be supplied with to drill bit D. Therefore,, in the last stage of control of carrying out step S10 described later, the answer signal of the content being ready to complete that cooling agent is supplied with sends to drill bit D side.

Sending after answer signal to drill bit D side, to step, S10 advances.

Although do not express in Fig. 2, this answer signal for example, in the time that idling speed in step S8 determines, determines that from rotating speed piece 50h sends to drill bit D via drilling processing signal interface 50e, signal line Ss.

In step S10, control device 50 judges whether drill bit D contacts with workpiece 400. Here,, if drill bit D contacts with workpiece, the cooling agent of pump 101 pressure rise that spues, so whether control device 50 rises according to the cooling agent of pump 101 pressure that spues, judges whether drill bit D contacts with workpiece.

If the cooling agent of pump 101 has spued pressure rise (step S10 is yes), be judged as: drill bit D declines, and contacts with workpiece 400, started perforation processing. Then, advance to the step S12 of Fig. 4.

On the other hand, if the cooling agent of pump 101 spues, pressure does not rise (step S10 is no), is judged as: drill bit D does not contact with workpiece 400, does not start perforation processing, and to step, S11 advances. In step S11, perforation process finishing that control device 50 judges whether to be undertaken by drill bit D, do not need to supply with cooling agent to drill bit D.

If the perforation process finishing of being undertaken by drill bit D, do not need to drill bit D supply with cooling agent (step S11 is yes), get back to step S1.

On the other hand, do not finish, need to supply with cooling agent (step S11 is no) to drill bit D in the perforation processing of being undertaken by drill bit D, to step, S10 returns.

In the step S12 of Fig. 4, control device 50 judges whether that the pressure P c(that spues of pump 101 is by pump pump that pressure measuring device 22 the measures pressure that spues that spues) be accommodated in goal pressure scope (permissible range). Here, goal pressure scope (permissible range), refers to respect to the goal pressure determining in step S8 it is that in the scope of error alpha of regulation, the error alpha of regulation is for example set as 10% of goal pressure.

,, in step S12, judge whether it is " goal pressure-α≤pressure that spues (Pc)≤goal pressure+α ".

If the pressure P c that spues of pump 101, than " goal pressure-α " low pressure (in step S12 " goal pressure-α > "), increases pump 101(or motor 1 in step S13) rotating speed, to step, S12 returns.

If the pressure P c that spues of pump 101, than " goal pressure+α " high pressure (" > goal pressure+α in step S12 "), reduces pump 101(or motor 1 in step S14) rotating speed, to step, S12 returns.

By the control of step S12～S14, start at drill bit D after the perforation processing of workpiece 400, the pressure P c that spues of pump 101 is accommodated in (goal pressure-α≤pressure P that spues c≤goal pressure+α) within the scope of goal pressure. And, if the pressure that spues of pump is accommodated in (goal pressure-α≤pressure P that spues c≤goal pressure+α) (step S12 is "Yes") within the scope of goal pressure, advance to step S15.

If the perforation of the through hole to workpiece 400 being undertaken by drill bit D completes, the cooling agent of pump 101 pressure that spues declines sharp. Therefore, in step S15, judge whether the pressure that spues of pump 101 declines sharp, judge whether thus by drill bit D, workpiece 400 to be bored a hole.

In the case of the pressure that spues of pump declines sharp (step S15 is yes), be judged as the drill bit bore of having bored a hole on workpiece 400, bore a hole to process and finish (step S16).

In addition, so-called " blind hole " in the situation that, if the perforation of the workpiece 400 being undertaken by drill bit D completes, drill bit D retreats from cutting position, so the cooling agent of pump 101 spues, pressure declines sharp. In other words, through hole is not only in the hole of being bored a hole by drill bit D, even so-called " blind hole ", if the perforation of the workpiece 400 being undertaken by drill bit D completes, the cooling agent of pump 101 spue pressure P c also sharp decline.

In illustrated control, in step S12～S14, if the pressure P c that spues of pump 101 is goal pressure scope (goal pressure-α≤pressure P that spues c≤goal pressure+α) (step S12 is "Yes"), even if then the pressure that spues of pump departs from from goal pressure scope, as long as no step-down sharp, also ignore (step S15 is no circulation).

In the perforation processing of being undertaken by drill bit D, along with the degree of depth of the boring of perforation on workpiece 400 increases, the cooling agent of pump 101 pressure rise that spues. But, for " fluctuation " in preventing from controlling, the spue variation ignorance of pressure of such pump.

If the cooling agent of pump 101 spues, pressure declines (step S15 is yes) sharp, is judged as the process finishing (step S16) to workpiece 400 perforation borings, is idling speed (step S17) by the speed setting of pump 101. This is because in the time that drill bit D is extracted from workpiece 400, for the borehole circumference portion that prevents workpiece 400 damages, spray required and enough cooling agents.

In addition,, after the perforation of being undertaken by drill bit D completes, if the rotating speed of pump 101 is identical with when perforation, can spray excessive cooling agent. To this, by the rotating speed of pump 101 being reduced to idling speed after perforation, can make refrigerant injection amount reduce.

After the speed setting of pump 101 is idling speed (step S17), get back to the step S10 of Fig. 3.

According to illustrated embodiment, by the spue instrumentation result comparison of pressure measuring device 22 of desired value (goal pressure) and the pump of pressure that spues of the cooling agent of pump 101, make the rotating speed of pump 101 or the rotating speed of electro-motor 1 increase or reduce. That is, in the illustrated embodiment, only high-pressure pump 2 spue pressure for control parameter, do not need pump 101(high-pressure pump 2) or the rotating speed of electro-motor 1 carry out FEEDBACK CONTROL.

In addition, in the illustrated embodiment, although make pump 101(high-pressure pump 2) or the rotating speed of electro-motor 1 increase or reduce, such control is not speed feedback control. This is for the pressure that spues of pump 101 is boosted or step-down.

According to illustrated embodiment, do not need to carry out complicated (pump 101 or electro-motor 1) speed feedback control, the only pressure that spues of control pump 101, the drill bit D to center by cooling agent suitably supplies with cooling agent.

As it will be apparent to those skilled in that, the cooling agent of the drill bit D at decision center by cooling formulation during with stream diameter, determines that in pump 101 sides goal pressure is very difficult corresponding to this automatically. This be because, the combination of drill bit D and pump 101 has countless, the cooling agent of the drill bit of this drill bit D also spreads all over sizes with stream diameter in addition.

According to illustrated embodiment, can be not by from center by the information of the drill bit D of cooling agent, for example about the cooling agent of the drill bit of the drill bit D arranging by the information of stream diameter to pump 101 sides inputs, and determine the internal diameter size (stream diameter) of cooling agent stream of drill bits and the pump that is best suited for this cooling agent stream diameter pressure (goal pressure) that spues in pump 101 sides. Therefore, countless even if the combination of drill bit D and pump 101 has, even if the cooling agent of this drill bit exists multiplely with stream diameter in addition, also can determine the pressure that spues of optimum cooling agent, suitably carry out the perforation processing by drill bit.

Illustrated embodiment is only illustrating, and is not the statement that limits the meaning of technical scope of the present invention.

For example, the performance plot representing in Fig. 5～Fig. 7 is according to case and difference. In addition, about interim rotating speed (being 1000rpm in the illustrated embodiment), for the stand-by time (with reference to step S6) of stabilization of speed, with respect to the spue admissible error α (desired value 10%) etc. of desired value of pressure of pump, also can change according to case.

In addition, in the illustrated embodiment, represent drill bit D as being supplied to the instrument of cooling agent, but also can adopt the present invention in the situation of other instruments being supplied with to cooling agent.

Description of reference numerals

1 electro-motor

2 high pressure generating unit/high-pressure pumps

3 suction pressure generating unit/low-lift pumps

4 foreign matters are removed and are used cyclone

5 pump driving shafts

6 rotating speed measuring devices

7 visuognosis pressure gauges

20 line filter

22 pumps spue, and pressure measuring device/pressure gauge spues

26 cutting powder pick devices

50 control device/control module

301 coolant reservoir

D drill bit

V1 safety valve

V2 flow channel switching valve

V3 check-valves.

Claims

1. a cooling agent feedway, is characterized in that,

Possess pump, measuring device and control device, described pump is supplied with cooling agent to instrument, the pressure that spues of described measuring device instrumentation pump;

Control device has:

According to the pump discharge flow of the rotating speed by pump and the pressure that spues decision, determine the function of the internal diameter of the cooling agent stream of instrument;

According to the internal diameter with stream by determined cooling agent, determine the spue function of desired value of pressure of pump;

This desired value and the pump measuring are spued to pressure ratio, the function that makes the rotating speed of pump increase or reduce; With

According to the pump the measuring pressure that spues, judge the function whether perforation undertaken by instrument has finished.

2. cooling agent feedway as claimed in claim 1, is characterized in that,

Above-mentioned control device possesses following function: in the stage that finishes after the no-load running of instrument, with instrument, workpiece bore a hole before processing, and the spue desired value of pressure of the pump when cooling agent of decision instrument is bored a hole with the internal diameter of stream with instrument.

3. a cooling agent supply method, is method from cooling agent feedway to instrument that supplied with cooling agent by, and described cooling agent feedway possesses measuring device and the control device of the pressure that spues of pump, instrumentation pump,

Described cooling agent supply method is characterised in that,

The pump discharge flow determining according to the rotating speed by pump and the pressure that spues, determines the internal diameter of stream for the cooling agent of instrument, according to the internal diameter with stream by determined cooling agent, determines the spue desired value of pressure of pump; The instrumentation pump pressure that spues, spues pressure ratio by above-mentioned desired value and the pump measuring, and makes the rotating speed of pump increase or reduce; According to the pump the measuring pressure that spues, judge whether the perforation of being undertaken by instrument finishes.

4. cooling agent supply method as claimed in claim 3, is characterized in that,

In the stage that finishes after the no-load running of instrument, with instrument, workpiece bore a hole before processing, the spue desired value of pressure of the pump when cooling agent of decision instrument is bored a hole with the internal diameter of stream with instrument.